Ruling out unitary Fermi gas of neutrinos as galactic dark matter

TL;DR

This paper rules out neutrinos as the primary component of galactic dark matter by applying the equation of state for a unitary Fermi gas, supporting the idea that dark matter is mainly light bosons.

Contribution

It introduces a novel application of the unitary Fermi gas model to constrain neutrino masses as dark matter candidates.

Findings

Neutrinos are excluded as galactic dark matter candidates.

Galactic halos likely consist of light bosons rather than neutrinos.

The model constrains fermion mass ranges for dark matter candidates.

Abstract

We investigate the possibility that galactic dark matter could be interacting fermions in the neutrino mass range. Assuming that galactic halos behave like a fluid in hydrostatic and thermal equilibrium, we employ the equation of state for a unitary Fermi gas to establish constraints on the mass of the fermion. Our findings effectively exclude neutrinos as candidates for galactic dark matter, and further reinforce earlier results suggesting that galactic dark matter is predominantly composed of light bosons.